Attorney Linda Cristello identified Azamat Tazhayakov and Dias Kadyrbayev two students from Kazakhstan, both 19-years-old, as two of the suspects, according to CNN. Cristello defended the two on immigration charges in the morning.

The third suspect has been identified as 19-year-old Robel Phillipos, and is a U.S. citizen.

Tazhayakov and Kadyrbayev are charged with obstruction of justice, and have waived bail. Phillipos is charged with making false statement.

Tazhayakov and Kadyrbayev disposed of a laptop and a backpack containing fireworks and gunpowder belonging to bombing suspect Dzhokhar Tsarnaev. Federal authorities later found the items at a landfill.

"He did not know those items were involved in a bombing, that's all we have to say about that," said Robert Stahl, attorney for Dias Kadyrbayev said. "We believe the citizens of Boston can listen fairly and accurately to the evidence."

Tazhayakov and Kadyrbayev were already in custody on immigration charges, according to CNN. The two violated their visas by not attending class frequently. Cirstello represented them Wednesday morning.

The new charges against them relate to incidents after the bombing took place, not the planning of the bombing.

"If they knew about the bombing, if they were involved in the bombing, the charges would be conspiracy to do the acts for which the other man has already been charged," defense attorney and Harvard law professor Alan Dershowitz told CNN. "So it sounds like at this point in time the only evidence they have is actions that took place after the bombing."

The two students were Dzhokhar Tsarnaev's roommates and had been detained by police for a while for violating their student visas, according to CNN. The two had stopped attending classes.

Tazhayakov left the country in December 2012, and his student visa was terminated in January of this year after the University of Dartmouth dismissed him. Although he did not possess a valid visa, he was allowed to return to the U.S. on Jan. 20, according to the Associated Press.

Tazhayakov and Kadyrbayev face maximum sentences of five years in prison and a $250,000 fine. Robel Phillipos faces a maximum sentence of eight years and a $250,000 fine, prosecutors said.

Police believe brothers Dzhokhar and Tamerlan Tsarnaev dropped pressure cooker bombs at the Boston Marathon on April 15, Patriots Day, then shot and killed a Massachusetts Institute of Technology police officer a few days later.

The FBI previously searched the parent's home of Russell, located in North Kingstown, RI. Agents removed bags of evidence from Russell's home, including one labeled "DNA samples."

Russell has been staying there since her husband was identified as a suspect. Her lawyer, Amato A. DeLuca, said she has been cooperating with FBI investigators.

Law enforcement officials discovered female DNA on a piece of one of the pressure cooker bombs, according to CNN, but it is unclear if it is tied to any suspects.

Investigators said the DNA could be from anyone, including a clerk who sold them the item.

The widow reportedly wanted her husband's body released to the Tsarnaev family. His parents live in Russia and recently canceled a trip to the U.S.

The bombing at the finish line of running's biggest annual race killed three people and injured more than 260. Tamerlan Tsarnaev was killed during a getaway attempt April 18 and 19; Dzhokhar Tsarnaev was injured but captured alive by authorities.

Officials said the two planned to detonate multiple explosives in New York City as well.

"We were informed by the FBI that the surviving attacker revealed that New York City was next on their list of targets," New York Mayor Michael Bloomberg said. "He told the FBI that he and his brother intended to drive to New York to detonate explosives in Times Square."

On April 19, the two brothers shot MIT police officer Sean Collier, according to authorities. The shooting began a chase and shootout that spanned hours and ended in the death of the older brother.

According to official accounts, Dzhokhar Tsarnaev got away after the first gunfight when he backed the stolen vehicle over his brother before running away. Tamerlan Tsarnaev was in cardiac arrest by the time authorities got him to the Beth Israel Hospital emergency room; doctors soon pronounced him dead.

Two years ago, Tamerlan Tsarnaev was interviewed by the FBI at the request of a foreign government the Bureau would not identify. Though no incriminating evidence came from the interview, their mother, Zubeidat Tsarnaeva, said her older son was "persecuted" by the FBI.

Investigators are also looking into whether Tamerlan Tsarnaev was trained by Islamic militants during his a six-month visit to Russia and Dagestan in 2012.

As they mounted the unprecedented manhunt, officials shut down all of Boston, Watertown and the surrounding area while they went door-to-door looking for the surviving suspect.

They were afraid the remaining suspect might have on an explosive vest - his brother had explosives strapped to his body when he died. CNN also reported police found homemade explosives during searches Friday, and experts performed controlled detonations throughout the day.

The two brothers were legal residents of the U.S. originally from a Russian region near Chechnya.

Dzhokhar Tsarnaev was on scholarship at UMass-Dartmouth. CNN reported he moved to the U.S. with family at the age of 9 and became a naturalized citizen less than eight months ago, on Sept. 11.

Tamerlan Tsarnaev was a former Golden Gloves boxer who had hoped to make the Olympics team. He and Russell had one child, a young daughter, together.

He was studying engineering at Bunker Hill Community College.

Dzhokhar Tsarnaev has been charged with using a weapon of mass destruction and destruction of property resulting in death.